www.sierraproperty.us / The agent told me to pay for the damages, but the price was too high

I have rented the flat through the website www.sierraproperty.us. I lived in the flat within one year and everything was ok. When I informed the rep that I wanted to move out, the rep arrived in the flat and started to check everything. He hasn’t warned me that he would come. Also he found several damages and told to pay for them, but I told that I could fix it on my own. But he refused and continued to ask for money. And he told me the price, but it was too high.